%0 Journal Article
%A V. Yu. Popov
%T Exact constants in Jackson inequalities for best spherical mean square approximations
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1981
%P 67-78
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1981_12_a9/
%G ru
%F IVM_1981_12_a9